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authorIra Weiny <ira.weiny@intel.com>2022-10-06 06:05:55 +0200
committerAndrew Morton <akpm@linux-foundation.org>2022-10-13 03:51:51 +0200
commitef6e06b2ef87077104d1145a0fd452ff8dbbc4b7 (patch)
tree57c08d46dad37f9879db3cedc124799973d36f38 /fs/ext4/verity.c
parentmm/page_alloc: fix incorrect PGFREE and PGALLOC for high-order page (diff)
downloadlinux-ef6e06b2ef87077104d1145a0fd452ff8dbbc4b7.tar.xz
linux-ef6e06b2ef87077104d1145a0fd452ff8dbbc4b7.zip
highmem: fix kmap_to_page() for kmap_local_page() addresses
kmap_to_page() is used to get the page for a virtual address which may be kmap'ed. Unfortunately, kmap_local_page() stores mappings in a thread local array separate from kmap(). These mappings were not checked by the call. Check the kmap_local_page() mappings and return the page if found. Because it is intended to remove kmap_to_page() add a warn on once to the kmap checks to flag potential issues early. NOTE Due to 32bit x86 use of kmap local in iomap atmoic, KMAP_LOCAL does not require HIGHMEM to be set. Therefore the support calls required a new KMAP_LOCAL section to fix 0day build errors. [akpm@linux-foundation.org: fix warning] Link: https://lkml.kernel.org/r/20221006040555.1502679-1-ira.weiny@intel.com Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reported-by: Al Viro <viro@zeniv.linux.org.uk> Reported-by: kernel test robot <lkp@intel.com> Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/ext4/verity.c')
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